摘要
基于行波法的双端故障定位是一种有效的高压电缆故障快速定位技术,测量故障行波和计算行波到达时间是影响定位精度的两个关键问题。首先,文中设计了一种增益可变的非接触式故障电压测量传感器,计算了增益调整参考曲线,用于指导传感器增益调节。然后,采用反馈式变分模态分解(feedback variational mode decomposition,FVMD)计算故障行波高频分量,结合魏格纳—威利分布(Wigner-Ville distribution,WVD)计算高频分量能量分布曲线最大值点,从而获得准确的故障行波的到达时间。PSCAD/EMTDC仿真验证该方法能有准确地确定故障行波的到达时间。最后,在一条退运的110 kV电缆线路开展了实验验证,结果表明定位误差不大于0.5%,远优于目前常用的几种方法。文中的理论和实验结果均表明,研制的新型传感器及选取的FVMD&WVD方法,能用于快速有效地确定电缆故障的位置,对开展电缆故障的快速定位以及运维抢修具有指导意义。
Two terminal fault positioning based on travelling wave is a kind of effective and fast positioning technolo-gy of fault of high voltage cable and the reaching time to measure the fault travelling wave and calculating travelling wave is the two key issue to affect locating accuracy.First,a kind of non-contact fault voltage measurement sensor with variable gain,the gain adjustment reference curve is calculated and is used for instructing gain adjustment of sensor.Then,the feedback variational mode decomposition(WVD)is adopted in combination with Wigner-Ville dis-tribution method to calculate high-frequency components of the faulty travelling wave and to calculate the maximum value of distribution curve of high-frequency component so to obtain the accurate reaching time of the faulty travel-ling waveform.PSCAD/EMTPC simulation method has the reaching time which can accurately determine faulty trav-elling waveform.Finally,the experimental verification is performed on one out of operated 110 kV cable.The result shows that the locating error is no more than 0.5%,which is more superior to the presently used methods.Both the the-oretical and experimental results show that the developed new type of sensor and the selected FVMD and WVD meth-od can quickly and effectively determine position of the faulty cable,which has guidance significance for the develop-ment of fast positioning and maintenance of the fault of the cable.
作者
崔江静
吴宏晓
南保峰
李莹
CUI Jiangjing;WU Hongxiao;NAN Baofeng;LI Ying(Zhuhai Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Guangdong Zhuhai 519000,China)
出处
《高压电器》
CAS
CSCD
北大核心
2024年第1期205-214,220,共11页
High Voltage Apparatus
基金
南方电网公司科技项目(030400KK52190132(GDKJXM20199169))。
